Prior though, she could do CPR at the very least while the ambulance was coming.
This is a terribly written article.
First she isnt letting him run on his own. She follows him on a bike.
Second the woman herself said she followed him to ensure his defibrilator doesnt go off. She cant stop that from happening, and if it goes off, he needs it to go off to restart his heart.
Then later downward, she says she started following him not because of the defibrilator but because he had some memory issues and maybe would run too much/long.
This story is all over the map.